BIOL 115 Lecture Notes - Lecture 22: Richard Lewontin, Inbreeding Depression, Genetic Drift
Document Summary
Lecture 22: spandrels of san marco: evolution and adaptation. Hardy-weinberg equilibrium: used to see genetic drift, the null hypothesis. C. if there are 8 individuals of 2 alleles that match at random then there"s no evolution happening (no drift, election, mutation etc) the equation to calculate this is p^2 + 2pq + q^2 = 1. 2: genetic drift is evolution by chance, in the example above, the phenotypes didn"t die. E. because of they were selected against but simply by chance/bad luck the effects of drift are stronger on smaller pops a they could die off more easily becoming smaller. 2 ways that genetic drift can result in big changes: genetic bottleneck: an extreme example of drift where an event results in a big decrease in. A: allel frequencies are more susceptible to chance effects/bigger effects of genetic drift: B. inbreeding: when closely related individuals mate in a small pop, theres not enough unrelated individuals to avoid inbreeding.
